Cement mixer



Nov. 13 11923.

F. W. HUBER CEMENT MIXER Filed April 5, 1923 ATTORNEYS. I

" reams Nov. 13, 192393.

u rr 'r FREDERICK w. nouns, or RIVERSIDE, carlrroamn.

GWEN! MIXER.

Application filed a in a,

To all/whom it may concern: v

Be it known that I, FREDERICK W. HUBER, a citizen of the United States,residing at Riverside, in the county of Riverside and State ofCalifornia, have invented new 'and useful Improvements in Cement Mixers,of which the follo'wingis a specification. c

This inventionfr elates to cement mixers or mixers for making Portlandcement grouts, and it has for its object to prov de improvements of thischaracter which will be superior in point of relative simplicity andinexpensiveness of construction,

taken conjointly with positivenem and effectiveness and efliciency andspeed in operation, facility in control and general serviceability. Suchmixtures or fgrouts', as

' above referred to, areusually. prepared by mixing the cement andaqueous fluid in large pans or boxes by means of a pressure hose, themixture being stirred by hand, or by some mechanical mixer with paddles.The first named method is the most reliable, but both methods arerelatively 'slow and require the work of a number of laborers.- Thepresent apparatus dispenses with much labor and produces a satisfactorily mixed roduct.

. With the a ove and other objects in view, the invention consists inthe novel and useful provision, formation, construction, combination,association and relative arrange .ment of parts, members and features,all

designated by ti:

as hereinafter described, shown in the draw ing, and finally pointed outin claims.

11 the drawing:

Figure 1 -'s a fragmentary central vertical sectional view of theprincipal features of a cement or grout mixer constructed in accordancewith the invention;

Figure 2 is a similar View of a modified form of construction; and,

Figure 3 is a detail transverse sectional view upon the line 3-3 ofFigure 1.

,Corresponding parts in all-the figures are same reference characters.

Referring wit particularity to the draw-' in-g, I have shown at A ahopper in the form of, an inverted truncated cone, the smaller ordischarge end of which communicates with a cylindrical mixing chamber Bwhich communicates with an outlet nipple,

pipe or spout G, there being a zone B of constriction between the mixingchamber B and the outlet conduit 0. The forms of 1923. Serial no.629,603.

construction in Figures Land 2 are the same, with the exception that thezone of constriction in Figure 1 is laterally of the mixing chamber.B,whereas in Figure 2 it is beneath such mixing chamber. The object ofproviding thevzone of constriction D, whetherat one side of or beneaththe mixing chamber B, is to produce a. more effective -mixing action orfinal mixing delivered per time unit may be determined and regulation ofthe supply ofsuch fluid may be had through a suitable globe valve orother. cook or valve device f, the fluid being supplied to' and throughthe pipe, through a suitable pump or by other agency,

or from a suitable source ofsupply. The fluidso introduced may be wateror other aqueous liquid not injurious to the cement. The nozzle, 6 ofthe pipe E is preferably disposed centrally of the top of the mixingchamber 50 that its discharge orifice is arranged substantially at thejunction of the hopper and the mixing chamber, such nozzle, in the useof a truncated conical hopper, extending approximately within thelongitudinal axis thereof, whereby the in-fiowing fluid is directed intothe mixing chamber in the same direction of flowas pursued by, andwithin the mass of, the cement supplied to the hopper A, by emptyingbags of cement into such hopper or otherwise. In practice I aim to keepthe hopper practically full of dry cement throughout the mixingoperation. The pipe E may be led into the hopper through the sidethereof, and the nozzle, of any desired or preferred form, joined to thepipe E by an elbow or unions, or the pipe E may be simply bent andreduced to form the nozzle, all within preference. In the'action andoperation of the mixer, the cement flows by gravity downwardly into themixing chamber conjointly with the fluid emitted from the nozzle e. Icall'attention to the advisability of having the axis of the nozzle epractically coincident with the vertical axis of the mixing receptacle,as otherwise the stream of Water will produce cross-eddies and will notgive a complete mixture, nor a uniform grout.

action, or commingling of the fluid and cedischarge conduit, such as thenipple or Also if the nozzle is placed at a considerable distance frointhe center, the device will not mix nearly as much grout, per writ oftime. The mix then passesthroug-h the pipe (1, to the point of use ortemporary storage. The mix produced as above described is found to besuperior in its evenness and smoothness of quality. The consistency ofthe grout will be governed by the relative proportions of cement andaqueous liquid in the grout, and these proportions are in turn governed,for any articular machine, by the speed with W ich the stream of wateror other liquid is introduced through the nozzle e.

The constriction shownat D, as will be understood, causes more or lessresistance of flow out from the mixing chamber, and hence causes thegrout to remain in the mixing chamber sufficiently lon to produce a verycomplete mixing of the cement and aqueous liquid.

The strong stream of water or other. liquid projected through the nozzlee,

violently cuts and churns the cement in the mixing chamber, thereby veryrapidly producing a very uniform and homogeneous grout, which flows awaythrough the utlet conduit C, while the constriction D prevents a toorapid flow, so as to allow sufficient time for a complete mixing.

By directing the fluid 'intothe mixing chamber in the same direction offlow aspursued by the cement entering such chamber from the hopper A, itis found that a more effective and speedy commingling of the cement andfluid occurs than when the cement and fluid are mixed by hand, or somesort of a mechanical mixer is utilized.

The invention in certain particulars and aspects provides a new methodof-cement mixing, as hereinafter claimed.

The direction ,of the mix laterally from the mixing chamber B, of courseimpedes the flow of the mix and materials thereof lengthwise of ordownwardly through the mixing chamber, thus causing a retardation offlow in that direction, which promotes the mixing action.

It is obvious that changes and modifica- J tions may be made inpracticing the invention, in departure from the particular featureshereinabove described and shown in. the drawing, without departing fromthe spirit of the invention.

Having thus disclosed my invention, I claim and. desire to secure byLetters Patent:

1. A mixing device comprisin an upright substantiall cylindrical mixingchamher, a lateral out et conduit having therein a constricted zone,means for introducing a jet of liquid at high velocity into said uprightmixin chamber, such introduction bein in the irection of flow of themass at t e point 0 such introduction, means for" delivering solidpulverulent material directly into said mixing chamber.

2. An improved mixer of the character disclosed, comprising an uprightmixing chamber provided with a feed hopper, means being provided forintroducing fluid to the mixing chamber in the same direction of flow aspursued by the material supplied to theemixing chamber from the hopper;said means comprisin a supply pipe entering the hopper latera ly andprovided with a nozzle 1n angular relation to such pipe and lyingsubstantially in the longitudinal her and opening directly thereinto, a.lateral outlet conduit connected to the bottom of said mixing chamber,said conduit having a mixing chamber, such conduit having a constrictedzone therein,

5. In a mixing device for roducingcement grout, a substantiallycylindrical mixing receptacle, means for introducing dry cement inadownward direction into the said cylindrical receptacle, a downwardlydirected nozzle leading into said cylindrical receptacle, asubstantially horizontal outlet conduit leading from the lower part ofsaid cylindrical receptacle, such conduit having a constricted zonetherein.

6. In a mixing device for producing cement grout, a su stantiallycyindrical mixing receptacle, means for introducing dry cement in adownward direction into the said cylindrical receptacle, a downwardlydirected nozzle leading into said cylindrical receptacle; the axis ofthe nozzle being coincident with the axis of the mixin receptacle, asubstantially horizontal out et con duit leading from the lower part ofsaid cyimaeeo lindrical receptacle, such conduit having a constrictedzone therein.

7. In a mixing device for producing cement grout, a substantiallycylindrical mixing receptacle having a vertical axis, means forcontinuously introducingdrycement by gravity, into said receptacle, adownwardly directed nozzle leading into said cylindrical receptacle andterminating at near the top of said receptacle at about the middle ofthe cross-sectional area thereof, a substantially horizontal outletconduit leading away from thelower part of said cylindrical receptacle,said conduit having a constriction therein.

'8. In a mixing device for producing cement grout, a feed hopper, asubstantiall cylindrical -mixi-ng receptacle located directly below thesame, a nozzle projecting downwardly into the top of said mixlngreceptacle at about the middle of said top, the whole of thecross-sectional area of the bottom of said mixing receptacle beingconnected with a lateral outlet conduit having a diameter substantiallyles /than .that of the mixing chamber.

9. In a mixing device for producing cement grout, a feed hopper, asubstantiall cylindrical mixing receptacle, located directly below thesame, and connected thereto, a nozzle projecting downwardly into the toof said mixing receptacle at about the middle of said top, the wholeof'the crosssectional area of the bottom of -said mixing receptaclebeing connected with a lateral outlet conduit having a constrictiontherein, said receptacle having an unobstructed passage-way.

10. A mixer for producing fluid cement grout, including a feed hopper,a' substantiallv cylindrical mixing chamber mounted below the same andadapted to receive dry cement therefrom, said chamber being whollyunobstructed .interiorly, a downwardly projecting nozzle substantiallyconcentric with said mixing chamber and terminating at near the upperend of said mixing chamber, and means for supplying liquid underpressure to saidnozzle.

11. A mixer for producing fluid cement grout, including a teed hopper, asubstan tially cylindrical chamber mounted below the same and adapted toreceive dry cement therefrom, a free unobstructed opening be-' ingprovided from said hopper into said mixing chamber, a downwardlyprojecting nozzle substantially concentric with said mixing chamber andterminating at near the upper end of said mixing chamber, and means forsupplying liquid under pressure to said nozzle, an outlet conduitleading from said mixing chamber havin a portion thereof adapted toimpede the eiilux of said grout through the same.

12. A method of forming a cement grout which comprises continuouslysupplying dry cement in a downward direction .by gravity, into a mixingchamber free, from standing water; simultaneously and continuouslydirectin a strong jet of liquid under pressure in a ownward directioncentrally into the mass of said dry cement in said mixing chamber,whereby the liquid and cement are mixed with each other, continuouslyallowing the exit of the cement grout from the lower part of the mixinchamber, while somewhat obstructing the ow of the grout therefrom,whereby the mixture is held in the mixing chamber-sufficiently long toproduce a thorough and uniform mixture; all of the liquid introducedbeing suplied by such downwardly directed jet of iiquid,-and allof theagitation being produce% by such downwardly directed jet of li ui ntestimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

FREDERICK w. HUBER. Witnesses W. T. HENDERSON, l. S. Locum.

